| 热软化效应对聚甲基丙烯酸甲酯刮擦变形定量模拟的影响 |
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| 引用本文： | 覃靖娴,徐杨,陈大勇,张晓飞,沈佳斌,郭少云.热软化效应对聚甲基丙烯酸甲酯刮擦变形定量模拟的影响[J].高分子材料科学与工程,2021,37(2):89-95. |
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| 作者姓名： | 覃靖娴 徐杨 陈大勇 张晓飞 沈佳斌 郭少云 |
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| 作者单位： | 四川大学高分子研究所 高分子材料工程国家重点实验室,四川 成都 610065;成都产品质量检验研究院有限责任公司,四川 成都 610100 |
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| 基金项目： | 国家自然科学基金资助项目(51420105004,51721091);四川省市场监督管理局科技计划(高分子材料刮擦性能测试技术及标准化研究)。 |
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| 摘 要： | 采用2种本构行为对聚甲基丙烯酸甲酯(PMMA)刮擦变形进行有限元模拟.结果表明,对PMMA而言,在模拟过程中若忽略屈服点后的热软化现象,则会导致刮擦模拟结果与实验结果产生较大偏差.但同时也发现,若在模拟时采用高速压缩测试获得的结果对P MMA刮擦过程中屈服点后的热软化进行描述,会导致刮擦模拟结果与实验结果产生更大的偏差...
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| 关 键 词： | 聚甲基丙烯酸甲酯 表面 刮擦 塑性形变 有限元模拟 |
Effect of Heat Softening on Quantitative Scratch Modeling of Polymethyl Methacrylate |
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| Jingxian Qin,Yang Xu,Dayong Chen,Xiaofei Zhang,Jiabin Shen,Shaoyun Guo.Effect of Heat Softening on Quantitative Scratch Modeling of Polymethyl Methacrylate[J].Polymer Materials Science & Engineering,2021,37(2):89-95. |
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| Authors: | Jingxian Qin Yang Xu Dayong Chen Xiaofei Zhang Jiabin Shen Shaoyun Guo |
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| Affiliation: | (Polymer Research Institute of Sichuan University,State Key Laboratory of Polymer Materials Engineering,Chengdu 610065,China;Chengdu Institute of Product Quality Supervision and Inspection,Chengdu 610100,China) |
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| Abstract: | Two constitutive behaviors were used to simulate the scratch deformation of polymethyl methacrylate(PMMA)in finite element modeling.It is demonstrated that ignoring post-yield heat softening in simulation can result in a considerable discrepancy between scratch modeling results and experimental results for amorphous polymers with relative low Tg,e.g.,polymethyl methacrylate(PMMA).However,it is also discovered that an even larger discrepancy between scratch modeling results and experimental results occurs if the post-yield heat softening behavior during scratch modeling is described by constitutive behaviors obtained through the high speed compression test.A deeper analysis reveal that this unexpected result is caused by a much larger temperature rise during the high speed compression test than that during scratch-induced deformation.To realize more accurate scratch modeling on PMMA,the thickness of samples used in the high speed compression test should be between 0.06 mm to 0.10 mm.However,currently high speed compression tests can only be conducted with thicker samples due to technical limitations,and it is not feasible to use thinner samples. |
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| Keywords: | polymethyl methacrylate surface scratch plastic deformation finite element modelling |
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